Looper mechanism for sewing-machines.



H. A. BALLARD. LOOPER MECHANISM FOR SEWING MACHINES.

APPLIOATION FILED DEO QG, 1907.

Patented Oct. 7, 1913.

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HAanIE A. BALLABD, or sosron, MAssAcnUsnTTs; assrenon To THE BOYLSTON MANUFACTURING COMPANY, 01;? :BosTou, nassaonusnrrsj a oonrona'rxon or New" JERSEY.

LOOIPER MECHANISM FOR SEWING-MACHINES.

To all whom it may concern:

Be it known that I, Hanan: A. BALLARD, a citizen of the United States, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Looper Mechanism for Sewing-Machines, of which the follow ing is a specification.

This invention has relation to looper mechanisms for shoe-sewing machines, and it is applicable to both chain-stitch and lockstitch machines.

. The object of the invention is to provide a simple mechanism by which the looper may be given the desired movement so that its nose may be caused to lay the thread as may be desired about the needle.

Referring to the accompanying drawings, Figure lrepresents a portion of a chainstitch shoe-sewing machine, and-illustrates in addition to the looper mechanism, the needle and its actuating mechanism and the thread finger and its actuating mechanism. Fig.2 represents in plan view the yoke or support for the looper and the looper bar.

, F ig. 3 is a detail view showing the eccentric needle. Fig. 4 represents sleeve or bushing for varying the orbit of movement of the looper and for varying the position of the looper nose relatively to the an embodiment of the invention which is particularly adapted to lock-stitch machines such as are employed for-stitching: the sole to the shoe.

Referringto the drawings and particularly to Figs. 1, 2 and 3, the needle a is supported. by a carrier 7) which is iournaled on a stud c. The needle carrier is actuated by a toothed segmental lever d, the teeth of 'which engage segmental teeth on the needle carrier. The lever a is oscillated about the pivot (Z by an eccentric (Z on the main shaft, c. This mechanism is fully described in my co-pendinp; application Serial No. 407,143 filed December 19, 1907, to which reference may be had for a complete machine embodying the present invention. f indicates a thread finger which may be oscillated about a stud j. Said thread finger is attached to an arm f having on its end segmental gear teeth engaging the complemental teeth on v Specification of Letters Patent.

Application filed December 26, 1907. Serial No. 408,034,

rammed Oct. 7, 1913.

clamped in the bent end of what I may call I the looper bar, as shown in Fig. 2. This bar is reciprocated and is also swung around an axis or center so that its end is caused to move in an endless path. The bar is mounted to slide in guides 13 in the ends of a yoke or support 14. The said yoke is provided midway between its ends with a depending; stud 15 which is journaled in an eccentric sleeve or bushing 16. This sleeve or hushin; is secured in a suitable bracket 17 and is provided with a milled or angular head 18 by which it may be rotatively adjusted. After adjustment, the eccentric sleeve is held in place by asetscrew 19. The rear end of the looper bar is pivoted upon a crank pin 20 which projects from a disk 21- 'formed on or StFCI'll'GCl to ashaft 22. The rotation of this shaft efiects the reciprocation of the looper bar and the oscillation of the looper bar and the yoke or support 14'about the axis of the stud 1.5 as will be readily understood. On the other end of the shaft 22 is secured a spiral gear 23 which intermeshes with, and is driven by. a complemental {rear 24 on the driving" shaft 6.

In a chain-stitch machine, such as utilized for attaching welt to the upper and inner sole of a shoe, it is desirable to lay the thread upon the needle with the bights crossed so that the loop will form a blackwall hitch when the needle is withdrawn. The teeth of the gear 24 and the teeth of the gear :23 may be so formed that, durim one rotation of the power shaft 6, the shaft 22 may be rotated first incne direction through an arc of approximately 450 and then through an arc of 90 in the opposite direction. To order to cause a dwell of the looper in its different are of 129 a sliding looper bar from-whichsaid looper scribed in my between this plementalgear said invention and described away of co1iout attempting to set forth all of the forms of its use, I declare that for said bar, and a crank rotatable about an positions, and after axis transverse to said bar and connected to the movements described, the gear 24 may be formed with peripheral ribs to engage complemental grooves in the gear 28 as desaid co-pending ap'pllcation Serial No. 407,143 filed December 19, 1907.

By rotatively adjusting the eccentric sleeve or bushing 16 from the position shown in Fig.2 through an arc of 90 to the right or to the left, the looper will be caused to move through an arc of a greater or a; smaller radius the case may be. But, i should the bushing be niovedthrough an l are of approximately 180 from the position shown in. Fig. 2, the yokeor support will be bodily adjusted transversely of the looper bar so as to adjust the looper relatively to the needle.

In Fig. 4, I have shown the looper mechanism which is applicable to lock-stitch machines, such as illustrated in my co-pending application Serial No. 331,529, filed August 1 21, 1906. here is practically no difference looper mechanism and that just described, except that the looper 25 projects upwardly-instead of downwardly. It",

port about its pivot and sliding said bar relatively thereto to cause the looperto encircle the needle so as to lay the loop thereon.

3. l'nv a sewing machine, a eurvedneedle and a looper mechanism comprising a pivoted yoke having guides at its ends, a looper bar mounted to slide in said guides on said yoke, a looper attached to one end of bar and projecting laterally therefrom, and a crank shaft whose axis is transverse to said looper bar and having a crank connected to the other end of said bar to recipro-. cate said-bar relatively to said yoke and rock saidyoke about its axis to cause the looper to encircle the needle.

In a shoe sewing machine, a barbed needle, looper mechanism comprising an oscillatory support, a looper bar mounted upon said support in bearings inwhich it is movable longitudinally of its own length, the axis of said bar being transverse to the axis about which said support is movable, a looper carried by said bar for laying the needle thread in the needle barb, an actuator for said bar, and means said actuator to describe'an endless path about an axis substantially parallel to the axis about which said support is movable, said actuator and bar having contiguous faces whereby the bar is reciprocated longi tudinally and laterally to cause the looper to encircle the needle.

5. In a sewing machine, a curved needle, a looper mechanism comprising a looper, a looper bar, a support for slidingly supporting said looper bar, a pivot for said support, a crank arranged transversely to and connected to said looper bar for sliding 1t and rocking said support,and an eccentric sleeve for said pivot, whereby said looper may be adjusted with respect to said needle substantially as set forth.

In a shoe sewing machine, .a barbed needle, looper mechanism compris ng a looper for laying the needle thread In the needle bar. a bar for carrying said looper, I a movable su port for said bar. a stationary support for said movable support, and

18 shown as clamped in the end of a cylindrical looper bar 26-adapted to slide in. guides 27 in the yoke 28 which is pivoted upon an'eccentric portion of rotatively adjustable stud 29. The rear end of the bar is secured in a socket 3Q which is pivotaflly connected to a crank pin 31 projecting from a disk: 32 on the shaft 83. On the upper end of he shaft is a spiral gear 34.- interlneshing with, and driven by, a com- I In this case it need not be necessary-to cross the bights of the'loop on the needle, and consequently, the gears. are "so formed that the looper is caused to move first through an arc'of approximately 240 where it dwells and then through an to its original starting point. Hav'ingthus explained the nature of my structingand using the same, although with.- in which it may be made or allof the modes wha'tI claim is 1. In a sewing machine, a curved needle and a looper mechanism comprising a looper,

being movable relatively to said is capable of and said bait movable support whereby it projects laterally, a support in which said bar is mounted to slide and having a pivot i bet-ween its-ends, and means rotatable about l compound movement, an actuator for said an axis substantially parallel and connected to the end of reciprocating it and rocking, said support about its pivot to cause the looper to ensaid bar is given a eompoundmovement to circle the needle, l cause said looper to encircle the needle.

' 2. In a sewing machine, a curved needle, I 7; "In a sewing machine, a curved needle, a looper mechanism comprising a looper, a I a main driving shaft, a looper bar extend sliding looper bar, a support pivoted being from the rear toward the front, a looper. tween its ends and having separated guides projecting laterally from said bar, an upto said pivot describe an endless path, said bar' and said for causing actuator having contiguous faces whereby the end of said bar for rocking said supmovable support being movable by said bar,

right shaft geared to said driving shaftand In testimony whereof I heve affixed my having ii crank connection with said looper signature, in presence of two Witnesses.

bar and an oscillatory support for said i looper bar in which said bar may slide, said I HARRIE BALLARD' 5 parts being constructed and arranged where- 1 Witnesses:

by said looper may be caused to encircle the I A. L. FoLsoM,

needle to lay the loop thereon. P. PEZZETTI. 

